On Tue, Mar 23, 2010 at 9:35 AM, WoodHacker <ramsa...@comcast.net> wrote:
> I understand how conj works. But how do you add a value to a > persistent vector? You have to add the new item to the vector with > (conj vector item), but how do you assign the return value to the > persistent vector. So far I have it working with a def -- (def > vector (conj vector item)) -- but I'm not sure this is 'pure' > Clojure. Is there a better way, functionally, or am I there? > Functional programming is the best way to go, but very few programs > can exist without mutable persistent data. > > Bill > conj _does_ let you add a value to a persistent vector. The question is how do you save this value for future use. Don't use def. Use a mutable reference type. One way: (def my-vector (atom [])) (swap! my-vector conj 'foo) @my-vector ; [foo] Depending on your use case agents or refs might be better suited. David -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
